package com.nowcoder.community.controller;
import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.entity.Page;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


@Controller
public class HomeController implements CommunityConstant {

    @Autowired
    private DiscussPostService discussPostService;

    @Autowired
    private LikeService likeService;
    @Autowired
    private UserService userService;

    /**
     * 首页展示所有帖子
     * @author ProgramCat
     * @date 2023/4/1 11:09
     * @param model 返回前端
     * @param page 封装分页相关的信息
     * @return String
     */
    @RequestMapping(value = {"/index","/"},method = RequestMethod.GET)
    public String getIndexPage(Model model, Page page){
        // 方法调用时,SpringMVC会自动实例化Model和Page,并将Page注入Model.
        // 所以,在thymeleaf中可以直接访问Page对象中的数据.
        page.setRows(discussPostService.findDiscussPostRows(0));
        page.setPath("/index");
        List<DiscussPost> list = discussPostService.findDiscussPosts(0,page.getOffset(), page.getLimit());
        List<Map<String,Object>> discussPosts = new ArrayList<>();
        if(list != null){
            for (DiscussPost post : list){
                HashMap<String, Object> map = new HashMap<>();
                map.put("post",post);
                User user = userService.findUserById(post.getUserId());
                map.put("user",user);

                //查询点赞
                long likeCount = likeService.findEntityLikeCount(ENTITY_TYPE_POST, post.getId());
                map.put("likeCount", likeCount);

                discussPosts.add(map);
            }
        }
        model.addAttribute("discussPosts",discussPosts);
        return "/index";
    }
    /**
     * 500异常界面
     * @author ProgramCat
     * @date 2023/4/1 21:58
     * @return String
     */
    @GetMapping("/error")
    public String getErrorPage() {
        return "/error/500";
    }

}
